机顶盒CA高级安全功能的研究

The Research of STB's CA Advanced Security Feature

条件接收系统的安全问题一直是数字电视领域存在的难题,从有卡CA到无卡CA,都缺乏有效的应对有段。文章先阐述了条件接收的工作原理,再介绍不同CA发展模式下存在的安全问题,之后讨论机顶盒破解和控制字共享等安全威胁以及相应的反制措施,最后提出机顶盒高级安全芯片方案可以实现条件接收系统的可靠性、安全性。

The security of conditional access system is always a difficult issue in digital TV field. No matter whether the CA with smartcard or the CA without smartcard, basically lacks of effective measure to cope with. This article firstly expounds the working theory about the conditional access system and introduces the existing safety problems among different CA development mode, and then discusses the STB crack and CW sharing, together with their corresponding counter-measures. At last, it puts forward a scheme about STB＇s advanced security chipset, which can realize security and reliability of conditional access system.